undefined (reading 'startsWith')

[abarrero10089]

HI
I tried several times but I always got this error, Some help please!:

[Main Instruction]
Command 'mdAL: Generate AL Code' resulted in an error
Cannot read properties of undefined (reading 'startsWith')
Command 'mdAL: Generate AL Code' resulted in an error:Cannot read properties of undefined (reading 'startsWith')

Caused by: java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.CompletableFuture.reportGet(Unknown Source)
at java.util.concurrent.CompletableFuture.get(Unknown Source)
at de.joneug.mdal.ide.command.MdalCommandService.execute(MdalCommandService.java:77)
at org.eclipse.xtext.ide.server.commands.ExecutableCommandRegistry.executeCommand(ExecutableCommandRegistry.java:105)
at org.eclipse.xtext.ide.server.LanguageServerImpl.executeCommand(LanguageServerImpl.java:951)
at org.eclipse.xtext.ide.server.LanguageServerImpl.lambda$executeCommand$46(LanguageServerImpl.java:943)
at org.eclipse.xtext.ide.server.concurrent.ReadRequest.lambda$doRun$0(ReadRequest.java:66)
... 5 more
Caused by: java.lang.NullPointerException
at de.joneug.al.SymbolReference.(SymbolReference.java:57)
at de.joneug.al.SymbolReference.parseFile(SymbolReference.java:71)
at de.joneug.mdal.generator.GeneratorManagement.readSymbolReferences(GeneratorManagement.java:121)
at de.joneug.mdal.generator.GeneratorManagement.readSymbolReferences(GeneratorManagement.java:98)
at de.joneug.mdal.generator.MdalGenerator.doGenerate(MdalGenerator.java:42)
at de.joneug.mdal.ide.command.MdalCommandService.lambda$execute$0(MdalCommandService.java:70)
at org.eclipse.xtext.ide.server.LanguageServerImpl$1.lambda$null$0(LanguageServerImpl.java:1094)
at org.eclipse.xtext.ide.server.WorkspaceManager.doRead(WorkspaceManager.java:438)
at org.eclipse.xtext.ide.server.LanguageServerImpl$1.lambda$doRead$1(LanguageServerImpl.java:1093)
... 6 more